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I don't think you can actually overfill a car with antifreeze. There is an overflow chamber that prevents this. Perhaps this overflow can be overfilled but in that case the worst thing that can happen is the little plastic cover pops off and you get some excess antifreeze on the ground.

It might also depend on the car. when car gets hot it will push coolant to reservoir (expansion) and when cold, into radiator. this is the function of the rad. cap....if u overfill reservoir it will only leak out of fill cap to the grd

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Q: What happens when you overfill car with antifreeze?
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What happens when you overfill the coolant in your car?

If you were to overfill the coolant in your car, then it would start to overflow and come out of the car. The most damage that this would probably do would be getting the coolant on the ground and wasting it.?æ


Can your car smoke if you put to much antifreeze in it?

If you overfill the reservoir and radiator with antifreeze, it will generally expand as it gets hot and spill out of the reservoir. When it does that, it will usually spill onto the hot engine and create "smoke".


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Once your vehicle is warmed up, if you have antifreeze coming out of the overflow you have too much in your radiator.


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A car's cooling system is designed to contain a certain amount of fluid. With too much in the system, the fluid will expand after reaching high temperatures and you might see a puddle of antifreeze. Don't worry, the puddle is due to the overfill Make sure to check your overflow reservoir after you shut off your car. Make sure that there is still some fluid left in it.


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